For my purpose i can not use refractory with “waterglas” contents, the heating coil, kanthal A1, does not like it.
I use a mix of refractory cement with waterglas to make some products, also mixed with fibers from ceramic blankets, depending the purpose and my needs.
the most important piece to understand, is how you cure, dry and bake, temperature rates to apply and so on…
Imagine that i do pulverize, in some occasions, refractory bricks that can withstand 1800ºC and this in matters of hours…
For the purpose as depicted above, i use a 4"by 6" ceramic sleeve, high alumina, loose inserted in the refractory cylinder with the heating coil surrounding the sleeve.
The set is then covered with 2" layers of ceramic blanket.
To make that 2" layer glow on the outside, imagine the temp inside…
Now i made the test setup with extra layers and a new frame to support the whole set.
I try to study/design/analyze per component/function and then combine the required components/functions into a working set.
Not always succesful ( the pictures i don’t post ofcourse )